export default {
	//为当前模块开启命名空间
	namespaced: true,
	
	//模块的state数据
	state: () => ({
		//购物车的数组,用来存储购物车中每个商品的的信息对象
		//每个商品的信息对象都包含如下的六个属性:
		//{goods_id, goods_name, goods_price, goods_count, goods_small_logo, goods_state}
		cart: JSON.parse(uni.getStorageSync('cart') || '[]')
	}),
	
	//模块的mutations方法
	mutations: {
		addToCart(state, goods) {
			const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
			
			if(!findResult) {
				state.cart.push(goods)
			}else{
				findResult.goods_count++
			}
			this.commit('m_cart/saveToStorge')
		},
		
		updateGoodsState(state,goods) {
			const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
			if(findResult) {
				findResult.goods_state = goods.goods_state
				this.commit('m_cart/saveToStorge')
			}
		},
		
		updateGoodsCount(state, goods) {
			const findResult = state.cart.find(x => x.goods_id === goods.goods_id) 
			if(findResult) {
				findResult.goods_count = goods.goods_count
				this.commit('m_cart/saveToStorge')
			}
		},
		
		saveToStorge(state) {
			uni.setStorageSync('cart', JSON.stringify(state.cart))
		},
	
		removeGoodsById(state, goods_id) {
			state.cart = state.cart.filter(x => x.goods_id !== goods_id)
			this.commit('m_cart/saveToStorge')
		},
		
		updateAllGoodsState(state, newState) {
			state.cart.forEach(x => x.goods_state = newState)
			this.commit('m_cart/saveToStorge')
		}
	},
	
	//模块的getter属性
	getters: {
		total(state) {
		/* 	let c=0;
			state.cart.forEach(x => c += x.goods_count )
			return c */
			
			return state.cart.reduce((total, item) => total +=item.goods_count, 0)
		},
			
		checkedCount(state) {
			return state.cart.filter(x => x.goods_state).reduce((total, item) => total += item.goods_count, 0)
		},
		
		checkedGoodsAmount(state) {
			return state.cart.filter(x => x.goods_state).reduce((total, item) => total += item.goods_count * item.goods_price, 0)
		}
	}
}